package start.demo01.cmd;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Scanner;

public class CpuUsage {
    public static double getCpuUsage() throws Exception {
        double cpuUsed = 0;
        Runtime rt = Runtime.getRuntime();
        Process p = rt.exec("top -b -n 1");
        // 调用系统的“top"命令
        BufferedReader in = null;
        try {
            in = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String str = null;
            String[] strArray = null;
            while ((str = in.readLine()) != null) {
                int m = 0;
                if (str.indexOf(" R ") != -1 && str.indexOf("top") == -1) {
                    //只分析正在运行的进程，top进程本身除外
                    strArray = str.split(" ");
                    for (String tmp : strArray) {
                        if (tmp.trim().length() == 0)
                            continue;
                        if (++m == 9) {// 第9列为CPU的使用百分比(RedHat 9)
                            cpuUsed += Double.parseDouble(tmp);
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            in.close();
        }
        return cpuUsed;
    }

    public static void main(String[] args) throws Exception {
//        System.out.println("cpu used:" + getCpuUsage() + "%");
        Runtime rt = Runtime.getRuntime();
//        while (true) {
            Scanner sc = new Scanner(System.in);
            String line = sc.nextLine();
            System.out.println("执行:"+line);
            Process process = rt.exec(line);
            InputStream in = process.getInputStream();
            while(true) {
                BufferedReader bufferedReader = new BufferedReader(
                        new InputStreamReader(process.getInputStream(), "GBK"));
                System.out.println(bufferedReader.lines());

            }

//        }

    }
}
